/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.myfaces.tobago.example.demo;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.enterprise.context.SessionScoped;
import javax.faces.push.Push;
import javax.faces.push.PushContext;
import javax.inject.Inject;
import javax.inject.Named;
import java.io.Serializable;
import java.lang.invoke.MethodHandles;
import java.time.LocalTime;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

@SessionScoped
@Named
public class WebSocketController implements Serializable {

  private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

  private ScheduledExecutorService scheduledExecutorService;

  @Inject
  @Push(channel = "clock")
  private PushContext push;

  public String startClock() {
    if (scheduledExecutorService == null || scheduledExecutorService.isShutdown()) {
      scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
    }

    scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
      @Override
      public void run() {
        push.send(LocalTime.now().toString());
      }
    }, 0, 17, TimeUnit.MILLISECONDS);
    return null;
  }

  public String stopClock() {
    if (scheduledExecutorService != null && !scheduledExecutorService.isShutdown()) {
      scheduledExecutorService.shutdown();
    }
    return null;
  }
}
